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The base of a lampshade is in the shape of a circle and has a diameter of 13 inches. What is the circumference, to the nearest tenth of an inch, of the base of the lampshade? (Use 3.14 for π.)

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The formula for the circumference of a circle is C=2πr, or πdwhere r is the radius.Substitute the values!C=πdC=(3.14)(13 in)C=40.82 inSince the given is round it off to the nearest tenth, then the answer is:C=40.8 in